bcftools expression string exact match

Hello,
If I execute this in bcftools 1.10.2

clinvar.vcf.gz is ftp.ncbi.nlm.nih.gov/pub/clinvar/vcf_GRCh37/clinvar.vcf.gz

bcftools query -i "CLNREVSTAT='criteria_provided,_conflicting_interpretations'"  -f '%CLNREVSTATn' clinvar.vcf.gz | sort -u

I get this results:

criteria_provided,_conflicting_interpretations
criteria_provided,_multiple_submitters,_no_conflicts
criteria_provided,_single_submitter

I was expecting to get only criteria_provided,_conflicting_interpretations. Is there anything that I don't understand.

Many thanks